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AIM

4/20/23

7

1

17

Meteorology

4.

Interpolation of time periods between AIRMETs over the contiguous U.S. valid times: Users must keep

in mind when using the AIRMET over the contiguous U.S. that if a 00

hour forecast shows no significant

weather and a 03

hour forecast shows hazardous weather, they must assume a change is occurring during the

period between the two forecasts. It should be taken into consideration that the hazardous weather starts
immediately after the 00

hour forecast unless there is a defined initiation or ending time for the hazardous

weather. The same would apply after the 03

hour forecast. The user should assume the hazardous weather

condition is occurring between the snap shots unless informed otherwise. For example, if a 00

hour forecast

shows no hazard, a 03

hour forecast shows the presence of hazardous weather, and a 06

hour forecast shows

no hazard, the user should assume the hazard exists from the 0001 hour to the 0559 hour time period.